CVE-2026-63854 (GCVE-0-2026-63854)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36
VLAI
Title
drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 663bed3c7b8b9a7624b0d95d300ddae034ad0614)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cf14826cdfb5c9fe10f98210d040b9d7486c381d , < e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c (git)
Affected: cf14826cdfb5c9fe10f98210d040b9d7486c381d , < 26c4f38529ac78930c9c4713e16ebc5b689bb0a3 (git)
Affected: cf14826cdfb5c9fe10f98210d040b9d7486c381d , < 2d6525e7b2504f5bbfe9417cddc1e8da858791dd (git)
Affected: cf14826cdfb5c9fe10f98210d040b9d7486c381d , < b076e45e6f757a2829e80d0144c1b5f201bee5af (git)
Affected: cf14826cdfb5c9fe10f98210d040b9d7486c381d , < f1e5a6660d7cbf006079126d9babbf0ccf538c6b (git)
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Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.12.91",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "5.9",
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              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit 663bed3c7b8b9a7624b0d95d300ddae034ad0614)"
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "value": "AV:L - Exploitation requires issuing DRM_IOCTL_AMDGPU_CS on a local AMDGPU render node (/dev/dri/renderD*); this is a local ioctl path, not a network-reachable interface.\nAC:L - An attacker with render-node access can reliably submit a command stream with AMDGPU_CHUNK_ID_FENCE targeting VCN v3.0 encoder/decoder rings without races or uncontrollable system state.\nPR:L - The vulnerable amdgpu_cs_ioctl path requires only authenticated render-node access (DRM_AUTH|DRM_RENDER_ALLOW), which is available to unprivileged local users on typical Linux systems with AMDGPU hardware.\nUI:N - No victim interaction is required; the attacker directly submits the malformed GPU command stream via ioctl from their own process.\nS:U - The vulnerability operates within the attacker\u0027s own AMDGPU/GPU context and does not cross a demonstrated security boundary such as VM escape or IOMMU bypass.\nC:H - Allowing unsupported 64-bit user fence submissions on VCN rings causes GPU-initiated memory writes with incorrect semantics; this class of GPU memory corruption can be leveraged for information disclosure.\nI:H - The bug permits GPU DMA writes to attacker-influenced virtual addresses through malformed user-fence handling, constituting a memory corruption primitive that could enable further exploitation.\nA:H - Malformed fence operations on VCN rings can hang the video engine or trigger GPU reset, causing denial of service affecting graphics and compute availability on the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:36:32.766Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f1e5a6660d7cbf006079126d9babbf0ccf538c6b"
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      ],
      "title": "drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63854",
    "datePublished": "2026-07-19T14:04:44.487Z",
    "dateReserved": "2026-07-19T07:54:57.016Z",
    "dateUpdated": "2026-08-05T12:36:32.766Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-21",
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      "percentile": "0.0314"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit 663bed3c7b8b9a7624b0d95d300ddae034ad0614)"
          }
        ],
        "id": "CVE-2026-63854",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {
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              "cvssData": {
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                "attackVector": "LOCAL",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-31T19:18:47+00:00",
      "cve": "CVE-2026-63854",
      "id": "CVE-2026-63854",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63854.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-18T00:47:25Z",
      "cve": "CVE-2026-63854",
      "id": "CVE-2026-63854",
      "initial_release_date": "2026-07-24T02:13:33Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "554",
      "product_status:known_not_affected": "167",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63854",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63854.json",
      "version": "9"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.